Analytical models of the wall-pressure spectrum under a turbulent boundary layer with adverse pressure gradient
This paper presents a comprehensive analytical approach to the modelling of wall-pressure fluctuations under a turbulent boundary layer, unifying and expanding the analytical models that have been proposed over many decades. The Poisson equation governing pressure fluctuations is Fourier transformed...
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Veröffentlicht in: | Journal of fluid mechanics 2019-10, Vol.877, p.1007-1062 |
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description | This paper presents a comprehensive analytical approach to the modelling of wall-pressure fluctuations under a turbulent boundary layer, unifying and expanding the analytical models that have been proposed over many decades. The Poisson equation governing pressure fluctuations is Fourier transformed in the wavenumber domain to obtain a modified Helmholtz equation, which is solved with a Green’s function technique. The source term of the differential equations is composed of turbulence–mean shear and turbulence–turbulence interaction terms, which are modelled separately within the hypothesis of a joint normal probability distribution of the turbulent field. The functional expression of the turbulence statistics is shown to be the most critical point for a correct representation of the wall-pressure spectrum. The effect of various assumptions on the shape of the longitudinal correlation function of turbulence is assessed in the first place with purely analytical considerations using an idealised flow model. Then, the effect of the hypothesis on the spectral distribution of boundary-layer turbulence on the resulting wall-pressure spectrum is compared with the results of direct numerical simulation computations and pressure measurements on a controlled-diffusion aerofoil. The boundary layer developing over the suction side of this aerofoil in test conditions is characterised by an adverse pressure gradient. The final part of the paper discusses the numerical aspect of wall-pressure spectrum computation. A Monte Carlo technique is used for a fast evaluation of the multi-dimensional integral formulation developed in the theoretical part. |
doi_str_mv | 10.1017/jfm.2019.616 |
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The Poisson equation governing pressure fluctuations is Fourier transformed in the wavenumber domain to obtain a modified Helmholtz equation, which is solved with a Green’s function technique. The source term of the differential equations is composed of turbulence–mean shear and turbulence–turbulence interaction terms, which are modelled separately within the hypothesis of a joint normal probability distribution of the turbulent field. The functional expression of the turbulence statistics is shown to be the most critical point for a correct representation of the wall-pressure spectrum. The effect of various assumptions on the shape of the longitudinal correlation function of turbulence is assessed in the first place with purely analytical considerations using an idealised flow model. Then, the effect of the hypothesis on the spectral distribution of boundary-layer turbulence on the resulting wall-pressure spectrum is compared with the results of direct numerical simulation computations and pressure measurements on a controlled-diffusion aerofoil. The boundary layer developing over the suction side of this aerofoil in test conditions is characterised by an adverse pressure gradient. The final part of the paper discusses the numerical aspect of wall-pressure spectrum computation. A Monte Carlo technique is used for a fast evaluation of the multi-dimensional integral formulation developed in the theoretical part.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/jfm.2019.616</identifier><language>eng</language><publisher>Cambridge: Cambridge University Press</publisher><subject>Aerodynamics ; Airfoils ; Boundary layers ; Computation ; Computational fluid dynamics ; Computer simulation ; Critical point ; Differential equations ; Diffusion layers ; Direct numerical simulation ; Distribution ; Fluctuations ; Fluid mechanics ; Fourier transforms ; Helmholtz equations ; Hypotheses ; Mathematical analysis ; Mathematical models ; Mechanics ; Physics ; Poisson equation ; Pressure ; Pressure effects ; Pressure gradients ; Probability distribution ; Probability theory ; Statistical methods ; Suction ; Turbulence ; Turbulent boundary layer ; Wavelengths</subject><ispartof>Journal of fluid mechanics, 2019-10, Vol.877, p.1007-1062</ispartof><rights>2019 Cambridge University Press</rights><rights>Attribution</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c335t-e02fcd1edb4665d367b0372d9ed3d66be450cd6848a007df72ffdb23652aec113</citedby><cites>FETCH-LOGICAL-c335t-e02fcd1edb4665d367b0372d9ed3d66be450cd6848a007df72ffdb23652aec113</cites><orcidid>0000-0002-5784-9449 ; 0000-0002-9659-5365</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://hal.science/hal-03158378$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Grasso, G.</creatorcontrib><creatorcontrib>Jaiswal, P.</creatorcontrib><creatorcontrib>Wu, H.</creatorcontrib><creatorcontrib>Moreau, S.</creatorcontrib><creatorcontrib>Roger, M.</creatorcontrib><title>Analytical models of the wall-pressure spectrum under a turbulent boundary layer with adverse pressure gradient</title><title>Journal of fluid mechanics</title><description>This paper presents a comprehensive analytical approach to the modelling of wall-pressure fluctuations under a turbulent boundary layer, unifying and expanding the analytical models that have been proposed over many decades. The Poisson equation governing pressure fluctuations is Fourier transformed in the wavenumber domain to obtain a modified Helmholtz equation, which is solved with a Green’s function technique. The source term of the differential equations is composed of turbulence–mean shear and turbulence–turbulence interaction terms, which are modelled separately within the hypothesis of a joint normal probability distribution of the turbulent field. The functional expression of the turbulence statistics is shown to be the most critical point for a correct representation of the wall-pressure spectrum. The effect of various assumptions on the shape of the longitudinal correlation function of turbulence is assessed in the first place with purely analytical considerations using an idealised flow model. Then, the effect of the hypothesis on the spectral distribution of boundary-layer turbulence on the resulting wall-pressure spectrum is compared with the results of direct numerical simulation computations and pressure measurements on a controlled-diffusion aerofoil. The boundary layer developing over the suction side of this aerofoil in test conditions is characterised by an adverse pressure gradient. The final part of the paper discusses the numerical aspect of wall-pressure spectrum computation. A Monte Carlo technique is used for a fast evaluation of the multi-dimensional integral formulation developed in the theoretical part.</description><subject>Aerodynamics</subject><subject>Airfoils</subject><subject>Boundary layers</subject><subject>Computation</subject><subject>Computational fluid dynamics</subject><subject>Computer simulation</subject><subject>Critical point</subject><subject>Differential equations</subject><subject>Diffusion layers</subject><subject>Direct numerical simulation</subject><subject>Distribution</subject><subject>Fluctuations</subject><subject>Fluid mechanics</subject><subject>Fourier transforms</subject><subject>Helmholtz equations</subject><subject>Hypotheses</subject><subject>Mathematical analysis</subject><subject>Mathematical models</subject><subject>Mechanics</subject><subject>Physics</subject><subject>Poisson equation</subject><subject>Pressure</subject><subject>Pressure effects</subject><subject>Pressure gradients</subject><subject>Probability distribution</subject><subject>Probability theory</subject><subject>Statistical methods</subject><subject>Suction</subject><subject>Turbulence</subject><subject>Turbulent boundary 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models of the wall-pressure spectrum under a turbulent boundary layer with adverse pressure gradient</title><author>Grasso, G. ; Jaiswal, P. ; Wu, H. ; Moreau, S. ; Roger, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c335t-e02fcd1edb4665d367b0372d9ed3d66be450cd6848a007df72ffdb23652aec113</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aerodynamics</topic><topic>Airfoils</topic><topic>Boundary layers</topic><topic>Computation</topic><topic>Computational fluid dynamics</topic><topic>Computer simulation</topic><topic>Critical point</topic><topic>Differential equations</topic><topic>Diffusion layers</topic><topic>Direct numerical simulation</topic><topic>Distribution</topic><topic>Fluctuations</topic><topic>Fluid mechanics</topic><topic>Fourier transforms</topic><topic>Helmholtz equations</topic><topic>Hypotheses</topic><topic>Mathematical analysis</topic><topic>Mathematical models</topic><topic>Mechanics</topic><topic>Physics</topic><topic>Poisson equation</topic><topic>Pressure</topic><topic>Pressure effects</topic><topic>Pressure gradients</topic><topic>Probability distribution</topic><topic>Probability theory</topic><topic>Statistical methods</topic><topic>Suction</topic><topic>Turbulence</topic><topic>Turbulent boundary layer</topic><topic>Wavelengths</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Grasso, G.</creatorcontrib><creatorcontrib>Jaiswal, P.</creatorcontrib><creatorcontrib>Wu, H.</creatorcontrib><creatorcontrib>Moreau, S.</creatorcontrib><creatorcontrib>Roger, M.</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Water Resources 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M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Analytical models of the wall-pressure spectrum under a turbulent boundary layer with adverse pressure gradient</atitle><jtitle>Journal of fluid mechanics</jtitle><date>2019-10-25</date><risdate>2019</risdate><volume>877</volume><spage>1007</spage><epage>1062</epage><pages>1007-1062</pages><issn>0022-1120</issn><eissn>1469-7645</eissn><abstract>This paper presents a comprehensive analytical approach to the modelling of wall-pressure fluctuations under a turbulent boundary layer, unifying and expanding the analytical models that have been proposed over many decades. The Poisson equation governing pressure fluctuations is Fourier transformed in the wavenumber domain to obtain a modified Helmholtz equation, which is solved with a Green’s function technique. The source term of the differential equations is composed of turbulence–mean shear and turbulence–turbulence interaction terms, which are modelled separately within the hypothesis of a joint normal probability distribution of the turbulent field. The functional expression of the turbulence statistics is shown to be the most critical point for a correct representation of the wall-pressure spectrum. The effect of various assumptions on the shape of the longitudinal correlation function of turbulence is assessed in the first place with purely analytical considerations using an idealised flow model. Then, the effect of the hypothesis on the spectral distribution of boundary-layer turbulence on the resulting wall-pressure spectrum is compared with the results of direct numerical simulation computations and pressure measurements on a controlled-diffusion aerofoil. The boundary layer developing over the suction side of this aerofoil in test conditions is characterised by an adverse pressure gradient. The final part of the paper discusses the numerical aspect of wall-pressure spectrum computation. A Monte Carlo technique is used for a fast evaluation of the multi-dimensional integral formulation developed in the theoretical part.</abstract><cop>Cambridge</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2019.616</doi><tpages>56</tpages><orcidid>https://orcid.org/0000-0002-5784-9449</orcidid><orcidid>https://orcid.org/0000-0002-9659-5365</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Aerodynamics Airfoils Boundary layers Computation Computational fluid dynamics Computer simulation Critical point Differential equations Diffusion layers Direct numerical simulation Distribution Fluctuations Fluid mechanics Fourier transforms Helmholtz equations Hypotheses Mathematical analysis Mathematical models Mechanics Physics Poisson equation Pressure Pressure effects Pressure gradients Probability distribution Probability theory Statistical methods Suction Turbulence Turbulent boundary layer Wavelengths |
title | Analytical models of the wall-pressure spectrum under a turbulent boundary layer with adverse pressure gradient |
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